Core/Entities: Regenerated updatefields code with latest generator fixes

Port From (https://github.com/TrinityCore/TrinityCore/commit/331b9ccd6a3be12e92e7c2aab7b793739b405d2f)

Source/Game/Spells/Auras/AuraEffect.cs

@@ -4141,11 +4141,15 @@ namespace Game.Spells
             if (!mode.HasAnyFlag(AuraEffectHandleModes.ChangeAmountMask))
                 return;
 
+            // handled in SpellInfo::CalcPowerCost, this is only for client UI
+            if ((GetMiscValueB() & (1 << (int)PowerType.Mana)) == 0)
+                return;
+
             Unit target = aurApp.GetTarget();
 
             for (int i = 0; i < (int)SpellSchools.Max; ++i)
                 if (Convert.ToBoolean(GetMiscValue() & (1 << i)))
-                    target.ApplyModPowerCostModifier((SpellSchools)i, GetAmount(), apply);
+                    target.ApplyModManaCostModifier((SpellSchools)i, GetAmount(), apply);
         }
 
         [AuraEffectHandler(AuraType.ArenaPreparation)]

Source/Game/Spells/SpellInfo.cs

@@ -2774,7 +2774,7 @@ namespace Game.Spells
                     }
 
                     if (power.PowerType == PowerType.Mana)
-                        flatMod *= (int)(1.0f + caster.m_unitData.ManaCostModifierModifier);
+                        flatMod *= (int)(1.0f + caster.m_unitData.ManaCostMultiplier); // this is wrong
 
                     powerCost += flatMod;
                 }